Thrust-bearing and dynamometer.



H. F. SCHMIDT.

THRUST BEARING AND DYNAMOMETER.

APPLICATION FILED JUNE 13. 1918.

Patented Mar. 25, 1919 HIS ATTORNEY IN FACT 55 horizontal shaft 8. As shown a HENRY r. sonmm'r, or ri'r'rsnunon, PENNSYLVAN A, ASSIGN'OR To wns'rr enousE can a DYNAMOMETER COMPANY,

A CORPORATION OF PENNSYLVANIA.

manner-Ba ama AND DYNAMOMETER.

:Speciflcation of Letters Patent.

mated Mar. 25, 19.19.

Application filed June 13, 1918. Serial No. 289,811.

To all whom it inay concern: Be it known that I, HENRY F. SCHMIDT, a

'citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny.

I of a thrust bearin embodyin ing in which the thrust is transmitted from a v to metal contact and State of Pennsylvania, have made a new and useful Invention in a Thrust-Bearing and Dynamometenof which the following is a specification. 1

This invention relates to thrust bearings and has for an object to produce anew and improved thrust bearing in which the thrust is transmitted by means of a liquid and in which the pressure of the liquid is a measure of the power transmitted by the apparatus imparting thrust to the thrust bearing.

A further object is to produce a new and improved thrust bearing in which a liquid under pressure is employed for counterbalancing the'thrust sure of the-liquid is automatically varied with the thrust load.

A further object is to improved thrust bearing 1n which means are employed for reducing frictional losses and wear to a minimum.

These and other objects are attained by means of a thrust bearing embodying the features herein described and illustrated in the drawing accompanying and forming a part hereof.

Figure 1 is a diagrammatic s'ectional view my invention.

Fig. 2 is a simi ar View 0 a modification of the thrust bearing illustrated in Fig. 1.

My invention contemplates a thrust bearrotatable piston to a stationary cylinder by means of 11 uid under pressure. T e bearing is'preferalily so arranged that the piston is held away from the ends of the cylinder by the fluid pressure so that the danger of metal is eliminated. Friction. is

thereby reduced to a minimum and consists merely of the liquid friction within the space between'the piston and the ends of the cylinder. I referably control the admission of fluid to t e cylinder-1n accordance with vari-' ations in the load imposed on the bearing. The mechanism for accomplishing this may also embody a dynamometer feature for ind1- eating the power transmitted by the apparatus to w ich the thrust bearing is connected.

In Fig. 1 of the drawings, I have shown a thrust bearing as applied to the end of the piston 9 is and in which the pres roduce a new and formed or mounted on the end of the shaft 8 and is inclosed within a stationary thrust resisting cylinder 10; The cylinder 10.is prothrough which the shaft 8 projects.- The, I thrust bearing is illustrated as adapteditp' counterbalance thrust in the direction in 1'- cated by the arrow. A constant flow of hereinafter called oil, is delivered to the cy1'- inder 10 between the piston. 9 and the cylinder head 11 and is maintained at a pressure sufficient to counterbalance the thrust load. The excess oil leaks past-the piston 9 and is drained from the other end of the cylinder by means of a'drain pipe 14.

The delivery, of oil to the cylinder 10 is controlled by means of a valve mechanism 6- which in turn is controlled by axial movements of the piston 9. 'As shown, a small plunger 15 extends through a boss 16 on the cylinder head 11 and is pivotally connected to. a multiplying lever 17 which controls the operation of the valve mechanism 6. The inner end of the plunger 15 rests against the piston 9 and is held in contacttherewith by t e force of a spring 32-acting on the lever 18. As shown, the lever 17 is fulcrumed on a stationary pivot pin 18 located above and relatively close to the plunger 15. A valve 19 in the valvemechanism 6 is connected to the other endof the lever 17 by a pin 20 locateda relatively great distance from the .plunger 15. 1 Consequently any movement of the plunger 15 will be greatly magnified in being duplicated by the valve 19.

As shown, the valve mechanism a cylindrical chamber 21 in which a movable annular valve seat 22 is provided for the valve-19. Oil under pressure is delivered to one end of the casing 21'by means of a conduit 23. The valve 21 is provided with two shoulders 24 and 25, both exposed to the pressure of the oil so that the valve is 6 in ludes alanced against internal oil pressure' Midway between the ends of the valve seat 22, I

have shown an annular roove 26 which cooperates with the shoulc er 25 on the valve 19 in controlling the delivery of oil to the cylinder 10 of the thrust bearing. As shown, the annular groove 26 is connected with the c linder 10 by means of a flexible conduit 2 I which extends through a slot 28 in the valve casing 21 and is provided with a loop 29 to increase its flexibility.

Oil under pressure delivered to the casing 21 tends to move the valve seat 22 so as to shut off the delivery ofoil tolthe cylinder 10, This movement is opposed by a heavy spring .30 located behind the valve seat.

If the oil pressure at the source of supply increases,.the valve seat 22 is moved so as prevent the piston -9 v the change of pressure. If" the pressure at the source decreases, the spring 3.0 moves' the valve seat 22 soas to increase the valve,

--opening and to therebyoompens'ate for the pressure drop. Within reasonable limits the piston is independent of fluctuations 'ofthe,

pressure of the oil and is therefore controlled solely by the valve 19, which of course is controlled by the-*piston-itselfso as to limit the movement of the piston to a nar- IOW Z0116.

In the thrust bearing ,illustrated, the

thrust may be measured either by means of a pressure gage 31 connected, as-shown, to the pipe 27, or.by means ofa. ointer 32 attache lever 17 The thrust bearing illustrated in Fig. 2

I is a modification of the thrust bearing illusa and 43. .Oil under pressure I the thesame manner as describe trated in Fig. 1. As shown,. a piston 35 is formed or mounted on the end of a shaft 36 and is inclosed within a c linden 37. T Oil under pressure is admit to one end of the cylinder 37 by means'of'a conduit 38' and is drained from the other end by a conduit 39; The delivery of oil to the cylinderis 7 controlled by means of a valve 40, which is i balanced against oil pressure and operates in a valve casin -,41 forming a part of or attached to the wall ofthe cylinder 37-. wWiths -in-the' casin 41 and surrounding the valve 11, I have s own two annular chambers 42 the chamber 42 by means of a'conduit The chamber 43 is connected-.with the 'cvli der 37 by means of the conduit 38, abo

referred to, and the flow of oil from the chamber 42 to the chamber 43 fand'henceto v the cylinder 37 is controlled by the valve40.

As shown, the valveis controlled by ,piston 35 through the mediumof- :a smal plunger 45 and a multile lever 46 ,in

. with the thrust bearing illustrated in Fi '1.

A tension spring 47 is shown for hol ing. Y the plunger 45 against the piston 35.

In operation, the piston 35 is moved by variations in the thrust load and inturn I moves the valve 40 so as to increase or decrease the fiow =of oilto-the cylinder 37 and to thereby increase or decreasecounterbalancing pressure in accordance withvariations intthe thrust imparted by the shaft 36;

- While I have described and illustrated but opening-and to thereby 4 rombeing aflectedby j to or forming apart o the multiple is. delivered :to

in connection from the spirit and scope of the invention I as set forth by the appended claims.

What I claim is:'

pressure to. the space 'between said members,

and means responsive-t0 axial movements of one of the members for controllingthe de livery of said fluid.

2. In a thrust bearing, relatively rotatable thrust members, means for delivering-fluid under pressure tothe space between said members, and means responsive to "axial movements of one of the members for magnifying said movements and for controlling lt)he delivery of the fluid to said thrust memers. I 3. A thrust bearing'comprising a stationary cylinder, a' rotatable piston -in'closedl within the cylinder," and means responsive to axial movements of the piston for con- .trolling the delivery of fluid under pres- .sure' to the. cylinder and for thereby r'estricting the axial. movement of the piston.

4. A thrus'tibeaijin comprising a cylinder, .a piston in'lbse by the cylinder and movable axiall' espouse to variations in the thrust -loa cans for admitting fluid under pressuretj' the cylinder and for controlling the amount-Di fluid delivered in respons'e tQf-YafihtiOIIS in the axial movement of the iston', and means'for measuring the 1 thrust-imparted by said shaft.

'5. In a device of the character described, relatively rotatable members, a source of fluid ressure supply, means for delivering fluid; From. said source to the space between he-jmemhers means responsive to axial 1m vements1flo one; of the members for controlling delivery of said flu-id and fluid ressure pensive-means for compensating iii-pressure of the fluid at the source. I

. 7o '1. In a thrust bearing,re1ative'l rotatable l :6. Ina stibea-ring, relatively -rotatable members, 1m "eans :for delivering fluid under; pressure 'toxthe space between said members, means-for controlling the delivery of saidfluid, and a multiplying lever actuated by oneof the members formagnifyin ,and transmittinggaxial movements. of sai member to'the controlling means. In testimony: whereof, I have'hereunto subscribed 1918. HENRY ESCHMIDT.

Witness: 4

C. W. McGHnn. a

myname this 12th day of-June, I 

